#
#    Copyright (c) 2021 Project CHIP Authors
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#

import chip.native
import ctypes
from ctypes import c_void_p, c_int32, c_uint64
from chip.discovery.types import DiscoverSuccessCallback_t, DiscoverFailureCallback_t

def _GetDiscoveryLibraryHandle() -> ctypes.CDLL:
  """ Get the native library handle with discovery methods initialized.

    Retreives the CHIP native library handle and attaches signatures to
    native methods.
    """

  handle = chip.native.GetLibraryHandle()

  # Uses one of the type decorators as an indicator for everything being
  # initialized. 
  if not handle.pychip_discovery_resolve.argtypes:
    setter = chip.native.NativeLibraryHandleMethodArguments(handle)

    setter.Set('pychip_discovery_resolve', c_int32, [c_uint64, c_uint64])
    setter.Set('pychip_discovery_set_callbacks', None, [DiscoverSuccessCallback_t, DiscoverFailureCallback_t])

  return handle
